Telephone-exchange system.



El R. MUBERTY.

TELEPHONE EXCHANGE SYSTEM.

APPLIUATION FILED DBO. 4, 1909.

Partant@ Aug. 25, wm.

mwzwmm@ F. R. MCBBRTY.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED DEO.4, 1909.

1 y l Bw Patnted Aug. 25, 19M.

5 SHEETSMSHEET 2.

ffl/732 P. R. MGBERTY.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED mso. 4, 1909.

1, 1 081,383a f Patented Aug. 25, wm

8HEETS-SEEET 3.

E. E. MCBERTY.

TELEPHONE EXCHANGE SYSTEM.

APLLIGATION FILED DEO.4,1909. 1,103,333, mama Aug. 25, 19M.

SHEETS-SHEET 4.

F. R. MOBERTY.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED DEU. 4, 1909.

Panedl Aug. 25, WML

5 SHEETS-SHEBT 5.

mosw

#Vif/Mmes. 6 Se' cuit having parallelfpathe ott-high andi nii-irnnea'rne n. Monetary, or NEW nociinntn, NEW veen, eesienon 'ro wne'riinn nime- 'rele ooMPANY', on New vonk, N. iena maroni-inicie or inLinoi'e.

i .i fspecicetion of Letters Eatent.

internem-monitrice stieren.

iariiteiina'f. ea, ieri.

App1icato1i,j1ed December' 4, 1909i vSerial No. 531,369:

To fill whomz' may concern.' Y

lie it known that L' FRANK it. MoBEirrY, citizen of the United States, residing at New tochelle, in the county of- 1Westch'otter andy 4tritate of New York, have invented'a certain ."-tclephone exchange systeme, a series of se@ lector Switch mechanisms are arranged and controlled 'to operate successivelyin making any desired connection, each-oi2 said switch mechanisme, by means ci. suitable controlling apparatus, being caused tiret to aseof ci'ateitself with afparticularjone oi? a plurality of groups oflines and then to operate automatically to find and make connection. to' an idle line of that group. These linee may lieti-units adapted to form intermediate y connectionsbetween the Subscribers" lince, oiv they inay he a'. group of subscribers lines extending to a single subetation, such as a private branch exchange. 4 They are ordinarily connected to multiple terminals of a plurality of selectors. i

The present invention relates more particularly to means associated with such 'seL lector-s to govern their operation in finding" and making connection to idle lines in groups, although it may be applied, if desired, to the control of selectors for pervlforiiiing other 'operations than that of connectingl lines. i

One feature ot the invention 4has tor its object to provide testing means which idees not disturb the circuits of busy linee when test connections 'are temporarily made thereto 'by the'selectors in sea-rch of an idle line,

:but which shall instantly create a busy testl condition at the terminals of an idle line when the testconneetion is made thereto. The testing means for this pnrpose'in -accoi-dance with the invention comprises ai cirresistancearespectively, the high resistance `path being, closedduring thetest of busy liiieefandthe low resista-nce path becoming closed only when connection is inade to an idle line. llheclosuie oi? 'the low resistance path is preferably nnderthe control of flow. of current in the high resistance path. The high 'and low resista nce paths in the teetcii:m cuit may he the winilings oi a. test relay, the lmvreeistance path 'forming a locking circuit to maintain that path closed. The test circnitl may he connected to a teet brush of the eelector, which brush is caused' in the inoive'inentoi' the selector to trail over a row of"testtciininals associated Withithe group euch selector is coi'ine'cted to a. suitable re- `7c tt" lines tof he tested. Each test terminal .of

sistaiice device through which the test circuit is completed as thebrush touches* that terminal and, as each such terminal is coniiected in niiiltipleto corresponding 'termi- 7 hals oi other' selectois,v ifjthe liiiebeinggI tested is lousy, acircuit would have been 4estalili'ehed throughits resistance device `:,iiid a low resistance path Would already have been connected in the circuit.4 The electrical condition of the, test terminal ivoiild therefore have been changed and upon the test connection being' made echar quently hy a colectorhunting an idlc'line in the group, the ilow oicnri'ent in the toet cir` cuit would kloe too small either to cauae a dief tuilnmce in the circiutnlready eetaliliehed j at `that terminal, or to cause the operation et the test i`elay and the selector would' inove tl'ietcst brush to the next terminal. in the rovv and eo on. Finally when thc-test eircait closed through a resistance device to which connection has not .already heen stalilrishcdfthe test relay oi euch selector vvouid respond and close the low resistancel path, ca nsingthe line asaociated with that terminal to thereafter test lousy to other selectors. l Another feature ot the invention has for ico its object to provide nie-ans fory governing the movable part of the selector to stop it quickly and hold it iii proper position to inake the desired connection, whereby the idle line, or for performing any other del sired function, thc relay will respond, cut out the motor magnet and cut into'circuit the stop magnet. The relay, being a very sensitive instrument, will thus cause the immediate removal of the motive power and the instant application of brake power when the desired position is reached by themov-r able member of the selector. v,

A third feature ofthe invention-has for itsc-b'ect to )rovide means in the testine circuit which will delay stopping the movable member of the selector vuntil the brushes thereof are centrally located in contact with the terminalsor` an idle line. According -to this feature of the invention, the relay for controlling the energization of the motor magnet is placed under the control of an interrupter actuated in the advance movement of the selector, the arrangementbeing such that the relay is rendered irresponsive to' flow of current in the test circuit, except at periodic intervals which correspond to the positions in which it may be desired to cause the selector to stop. This relay for controlling the energization of the motor magnet of the selector and the test relay heretofore referred towhich has highand low resistance windings are preferably included seri-- ally in the test circuit, a shunt path for the first mentioned relay being closed by the interrupter while the test brush is traversingthe spaces between successive test terminals and opened momentarily while said brush is centrally located in contact with each of saidtest terminals. The motor control relay is preferably of low resistance and is made irresponsive to flow of current in the test circuit by way of the high resistance winding of the test relay when the test brush is in contact with terminals of busy lines; it is, however, adjusted so as to respond 'quickly to flow of current in the test circuit when the low resistance shunt path is closed about the high resistance winding of the test relay.

For the purpose of illustrating-the invention, there are shown in the drawings which accompany this application a single selector and the apparatus associated therewith for governing its operation. It will be'understood that in the construction of alarge telephone exchange system there'would be several such selectors operated successively in the establishing of any one connection. The invention herein described and claimed may he applied to the control ofany one of such selectors. The one yshown is an olice switch and is the second of a series in anA actual exchange.

In the drawings-Figure lshows the circuits and apparatus which are directly associatcd with a single selector switch mechanism; Fig. 2 shows the circuits ot a sultable controlline' a. aratus connected overlelevations respectively of' the sequence switch, while Fig. 5 is a View in cross section on line 5-5 of Fig. 4, and Fig. 6 is a view in cross section on line 6-6 of Fig. 4. Figs. ,7 to 11 inclusive are detail views of parts of the switch mechanism, Fig. 7 show-l inn;V a contact device in the normal position of the switch, Figs. 8 and 10 the same in (liiierent ofnormal positions and Figs. 9

' and 11, the brushes of the switch in oit-normal positions corresponding respectively to those of Figs. S and 10.

The same reference characters are used to indicate the same or like parts in the several drawings. in the form of automatic switch shown in Fig. l, the switch carriage or movable element is provided with a number of sets of multiple brushes, any particular set ofA which may be selected for service and the switch carriage then advanced over a series of setsof line terminals until the selected brushes are brought into engagement with thc terminals oi an idle line.

rllhe switch carriage or brush carrying member .is of the rotary type, the traine 2l of which is mounted upon a central standard or shaft 22. At the outer end of the trame a number oi sets of contact brushes 253,. 24, Q5 are piroally mounted upon but insulated from a rod 2G, and from each other, in position to sweep over sets of line terminals 27, 28, 2f. The brushes have inwardly extending arms 30, bearing against which, one for cach brush, are springs 31. Latches 3Q. one for each set of three brushes7 are pivotally mounted upon a rod 33 and arranged to normally hold the brushes from being rocked outwardly into line with the stationary terminals.' Bearing against the inner ends ot the latches are springs 3?: which hold the latches firmly against a stop rod 36. This stop rod 36 serves to prevent the Vlatches from being moved forward too tar after the brushes vhave been released.

A stop bar serves to limit the outward movement of the brushes when the latches are withdrawn. The latches 32 and stop bar 35 are of insulating material so that the circuits connected with the brushes will not he crossed thereby. The springs 3l make electrical connection with the brushes; they are of' sheet metal and form the teeth of combs'which connect corresponding brushes i, tossine This shaft is adapted by mechanism, to be presently described, to be rotated so as to bring the fingers one after another' into the line of travel of the several latches on the brush carriage. Only one set ot' brushes is intended. to be released in a ginenwoperation.

.The shaft is lirst rotated to bring a particular linger Vinto position. to engage the latch in the same level therewith and then the brush carriage is rotated. ln passing, the voutward edge ot this` latch strikes the end of the finger, allowing one set ot' three brushes to be released. Continued move ment of the brush carriage brings the selected set of brushes into engagement with the rows of stationary terminals in the same level therewith, these brushes trailing over the terminals and making contact therewith inpassing. The brush carriage is finally caused to stop with the selected lbrushes in 'Contact with some one set of stationary terminals. The other brushes, not being1 released, are held out of Contact with thev terminals over which they pass. A further movement of the brush carriage in the same vdirection 4"ot rotation will carry the brushes over a restoring roller 69, which may be pivoted to the frame and which engages the .'t'ree ends of the released set, causing them to be pushed back into their normal latclufd position. After making u full reif'olution, the brush carriage is brought to rest in its normal position again.

ln the normal position oi the brush carriage, as shown in Figs. land 7, a pair of levers vl-Q., i153 iiivoted upon the rod 2G, the lutter being insulated therefrom, engage at their tree ends a normal stop plate -l-G. At the end ot' lover l2 is a roller 7l which lies in a recess of plate 46, and at the end ot lever 422i is a right angle extension arm 72 which makes electrical contact with said plate 46; A coil spring,` 54:, acting upon an invardly extending arm 44. serves to press the roller 7l with considerable torce against plate 46 and thereby holt s the brush carriage securely in its normal position. fr flat spring 52v` engages an inwardly extend armv 45. of the lever 43 and serves to press this lever outwardly but with less torce than that ot the coil sprine 54. The spring 52 also makes electricalcontact with lever 43; 1t is secured to but insulated "from the shaft 22 ot the brush carriage and ter mina-.ttes in a Wire clip 53. As the brush earriuge is moved to curry the brushes over the statimmry terminals, the roller 7l and the extension arm 72 engage the teeth of a cau/1 plate 50. The roller 7l rides over the teeth while the brushes are passing between successive terminals and diops into a notch (Fig. 8) as any released set oi' brushes is centrally located in direct Contact with a set ot' terminals (Fig. il). The extension arm `i2 follows behind the roller one tooth or notch and likewise engages a toothas the brushes are passing between successive terminals. lit passes through the space between teeth, however; without touching the plate 5() (Fig. S) us the released set ot brushes is centrally located in contact with the ter- 'ninals `The stop bar 3.5 engages the iu- \\'ordl v extendidoarm elf just as it docs the arms il() of the brushes and thus prevents the extension arm 72 ot the lever til lrom touchiun' the bottom el the notches between the teeth of plate 50, while permitting said arm T2 to touch and malte contact with the top ot' the teeth. 'l`he teeth and notches ol plate o() are so spaced and arranged with respect to the cont-uct lever LIl-Ci that the extension arm 72 will not break contact with a tooth ot' plate 50 (Fig. l0) until atter the brushes malte contact 'with the stationary terminals (Fig. l1) and the roller Tl :is ready to drop into a notch. rlhe circuit arrangement, as will presently appear, is such that the motive power :for driving the brush carriage can not be eut oil' until the contact thus broken between lever ttl and plate 50 and therefore not until the brushes are in position to make goed contact with the `stationary terminals. lhe brush selector is also provided vwith an interruptor or malte aud break Contact device comprising' au arm oli pivoted to thetrame at 5T, engaging at its 'free end n toothed wheel. or ram Btl which rotates with the shaft Lil). This arm 5G is adapted iu the rotation ot" the shu'tt to engage two contacts itl and G0. '.lhcse contacts may be springs, the 'tree ends only ol which are shown in the drawing. ln its normal position the tree end of the arm 5G lies in a notch of the cam which is deep enough to insure an` open connection with Contact 59. When the ,shaft is away from its normal position, however, connection is made continuously with contact 39. The conmcthm with Contact ll() is intermittent. this contact being made when the arm o() is lifted by cach tooth ot the cam. T here are as many teeth ou the cam as there are tingers il on the spindle 4() and therefore as many as there are sets ot brushes.

The motor mechanism for causingrotsn tion ot the brush carriage comprises an an nula-r iron friction dish (il flexibly niiounted at the lower end ol the spindle W un electation thereof until the roller 86' reachestlid bottoni oi the following notch. The rotary switch begins to rotate, the contact through 'which the 'motor magnet was initially er#l cited may be broken, but the local circuit will be maintained for the motor magnet through the contact closed by the cam' 85, and the rotary element will thus continue to advance until the cam roller 80 reaches the bottom of the nent notch of the earn 85.

In Fig. 1 the switch springs ot the sequence switch are not shownin their actual arrangement, but are so located as to give a clear arrangement of the circuits; and the operating cams are not shown. rllhe clutch or motor magnet 81, its driving dish 79 and roller 80 are shovvnl together with the various sequence switch springs and contacts 101 to 110 inclusive, the motor magnet, switch springs and said contacts being` located in the drawing,y in their proper circuit positionswithout particular regard to their structural arrangement as shown in Figs. 3 to 6. The positions of the rotary elements of each sequence switch in which any of its contacts (except contact 101) are closed, are indicated by numbers placed adjacent to such contacts; each contact being open in all positions except those indicated by rei erence numbers. For example, Contact 102 is closed in the second and fifthpositions as indicated ,by the numbers 2 and 5 placed adjacent thereto. ln the oase of the special. Contact 101, operated by cam 85, the num.- bers are placed on the opposite side of the switch lever from its contact anvil and indicate positions in which the contact is opened, said contact being closed continuously while the rotary element of the sequence switch .is in transit between the positions indicated. lt will therefore be understood that the special contact 101 is closed continuously between positions 1l and 2, 2 and .3,

3 and 5, 5 and 7 and 7 and 1, but opened when. the sequence switch is either resting in or passing,l by any one oi these Positions.` There may be, sayeight positions of the sequence switch, and the cams thereof will be caused to make one complete revolution in passing from normal (position l) through the eight positions and hack toV normal again.

in Fin.k 2. This apparatus coinprisesa series of counting relays andV a seriesoi controlling switches or keys, together with a fetepping relay for operating the counting; Lrelays in succession-to close contacts in circuit with switches or keys and a cut-oil' re* llay ada 'ated when the circuit iis-closed siniultaneo'usly by one ol* the counting;r relays and the particular switch or lacy diu'iressed, to open the controlling,l circuit and stop the movement ot' the selector; As shown, there are two series et countingl inlays, (lne-se- `ries,comprising,l relays 201 to 208 inclusive, are adapted respectively to close contacts 201, to 268 in circuit with the 'lreys 251 to y and the eut-oil relay 223. The other series or counting relays 211 to 218 inclusive serve the purpose of closing circuits for relays 201 to 208 and are caused to operate in alternate succession with said relays 201 to 208. These two series et relays may be eirdesired number. '.lhe stepping relay 22aL .nis arranged to be energized and deiiergized intermittently iii the movement of the selec toi', as will be presently explained. l"Upon the first energization, it closes its front con-i tact 225, which completes a circuit from `battery 226 through contact 234, auxiliary countingrelay 211 and back contact 220 oli' oounting' relay 201, 4whereupon relay 211 is energized and closes a lockiiui circuit by i way of its contact 229. llelay 211 also closes i contact 230. rlhen when the stepping; relay is denergized, its armature falls hack, clos- ,ing contact 231, thereby completing a circuit for counting; relay 201by Way of batitery 220, contact 232, Winding' of relay 201, contact 233 oi= the second auxiliary ycountinng relay 212, and Contact 230 of the first auxiliary relay 211. Relay 201 is `thereupon energized and it, like relay 211,n closes a locking circuit by Way of Contact 261. As before stated, however, Contact 261 is also in circuit With the cut-oli` relay and the first of a series ol.l controlling switches or keys 251, so that if this key had been depressed, the operation of the first counting relay 201 would cause the cut-oil relay 223 to open the circuit olf the stcppii'ie; magnet 224. lt therefore follows that the number oi. impulses oi' current flowing through the winding;1 o' the stepping relay before the c1.|t-oll' relay 223 shall opcii the circuit oit' the stepping relay depends upon the .particular controllingr switch oi.' key which had been depressed.4

rlhe steppingrelay 22d is included in a loop which may he associated with the trunk line conductors and 236 leading;- te the selector switch mechanism shown in Fin". 1, suitable switch contacts 237 and 288 benin' provided for iiialiing the connection when it is. desired to cause the selector to perform a particular switcliinp,l operation. The trunk line conductors 235 and 236 may have associatedtherewith a third conductor 2:51) ini tended in an obvious manner to include any yanother selector that maybe interposed in the circuit when the selecting operation which is about to be described takes place.

Referring nowto Fig. 1, which shows the apparatus and circuits associated with the selector switch mechanism, it will be noted that the trunk line conductors 235 and 236 are normally, that is, when the sequence switch-is .in position 1, connected through sequence switch contacts 103 and 104 to form a loop circuit with a line relay 121 and a battery 122; also that conductor 239 is con- -nected through a trunk relayv123 and a normal contact 105 of the sequence switch to battery 122-. Contacts 10? and 104 of the sequence switch are closed in the `iirst and second positions thereof, while contacts 106 and 107 thereof are closed in the fourth and fifth positions, to extend the circuit of' the trunk line to the brushes 23 and '24 ot the selector mechanism. Theline relayhas a back contact124 and a front Contact 125 which are adapted to complete certain local circuits enter-ing into the control of the selector and the sequence switches, as will presently appear. The trunk relay 123 is adapted when energized to close a locking circuit for its winding by way of contact 126 and'battery 122 and at the Sametime to open contacts 127 and 128and close contact 129. Contact 127 is connected through a resistance 130 tothe normal stop plate 46 of the selector mechanism, and contact .129 is connected toA the Winding of a motor control relay 131., this relay' being adapted in the third position of the sequence switch to be included in a test circuit by way of a high resistance winding 132 of a test relay 133 and contact 108 ofthe sequence switch. The test `circuit terminates in the test brush' 25 of the selector switch mechanism. It may be closed to -ground by 'way of lcontact 109 of the se quonce switch, this Contact being in parallel relation to the front contact 129 of the trunk rela A low resistance shunt Winding 1.25/1- of tie test relay 133 is adapted to be closed by its front contact 135. Leading from the conductor joining;I relays 132 and 133 is a conductor 137 which is connected by Way ol spring 52 to the contact lever 43 of the switch mechanism. When the selector is -in normal position, this switch lever is resting in contact with the normal stop plate 46, but when 'the brush carriage moves 'the' brushes over .intenses the terminals, thc lever 13 makes contact intermittently with the tooth ot plate 50 which is conucctci'l to xground. lt will thus Vhe. secu that thc'circuit completed through luoiuluctor i257 excludes the test relay 133 when tho selector is in normal position and intermittently excludes the motor control relay 131 by shouting it when the brushes are trailing over theV tcrn'xiuals. The n'u'itor control relay 131 closes at its back contact 138 a circuit :tor the motor magnetA 62 of the selector, this circuit including' also scquonce switch contact 110 closed inthe third,

fourth, seventh and eighth positions; it also closesat itsffront contact 139 a circuit for the stop magnet of the selector and a circuit for the motor magnet 81 of the sequence switch, the latter circuit including a sequence switch contact 111 closed in the third and seventh positionse i It will be noted falso that while the sequence switch is in its normal position, the circuit of its motor magnet 81l may be closed by Way ofthe front Contact 125 of the line relay 121 and sequence switch contact 112;\and that in the second position, the circuit may be `closed through the back contact 121i of the-line relay 121 and sequence switch 113. In the second position of the sequence switch, a circuit'may; also he closcdflor the motor magnet 68 of the brush selcctorb'v way of the iront contact 125 oi `the linel relay and sequence switch contactv lill. `Wl1ile the lse-l quence switch is in positions 5 to l inclusive, the local circuit is closed for this motor magnet 68 of the brush selector by way of sequence switch contact 115 and contact 59, this latter Contact being closed at all posi tions of the brush selector except normal.

it will be understood that the primary function of the selector switch shown in Fig. 1v is to interconnect lines for telephonie com munication. As before stated, these lines may bev trunks forming intermediate connecting links betweenvthe subscribers lines. Thus the conductors and 236 may be extended to the lett in Fig. 2 through suitable mechanism and conductors to a calling subscribers line and conductors 140 and 141, which are connected to terminals 27 and 28 o'l thcvselector, muy be extended to the right iu Fig. 1 through suitable mechanism and conductors to a called subscribors lino. 'l'crminal 29 is connected through a resistance 142 to the free pole ot' buttery 122. [t will be understood that the terminals 27, 2S and 2) ot' the selector switch .may and would ordinarily be connected iu multiple to the corresponding terminals ot' other selectors.

The battery 122 4 sitions -in the circuit diagram of Fig. 1 merely for clearucss in illustrating the circuits, and it will be understood that these several representations `of battery are to be considered vas meaning a single battery, `alis sl'iown in several. po-4 'Vt-haugh, if ilosirezl, aovm'al"liattrriea may li mnpliiyvil. This battery ymay lw.y ouv having a potoutial of any Vl'orty-moght volta. 'llw` l-ollou'inlgY roaiallani-a vali'uu haru'lairn lounil suilfahla for tha that relays mul rlaiulani-o ll in llwv tust, wirf-uit: ri-lay lill, fillol'uua; winding 132 ol ri-lay 133, 100() ohnis; wuuling' 1534, :'ifoluufi; anrl resistant-u 142, Z50() ohms.

f clvaell.

rontrolliirnf apparatus into operativo rela-v 'tit-n to tho aelortor. Thse, and also contar'h's 332 anil Q34, may lio operated mannally. lult preferably hy a. saaiunoa uwitrh nmolianiran olE tho aaino pfanoral vonatruation.

as; that Shown in Figs. 2 to 5. llt ia )unruly l 'for lha aalool" nlinplirity in.` the illustrative iliagrani that aiu-h Soquence Switch muchaniani is omitted inl Fig'. 2. The cloaing'o'l' contact Q-ll. vomplntus a circuit Jfor the trunk rolay 1Q?, hy way of sequence switch. oon,- tac't 105. Conilui'toi" 239 anil roaistancoQ-fl-l). ln operating, the trunk relay closes; a lori:- ing;` circuit by way of its own Contact 126.

It will thus he noted that the trunk relay `will remain energized .inilepenclcntly of the saquear@ switch contant 105, lout'that it is under the 'control ol vonta'ct Q41 so that uhfncvar ('ontact :241 is; opened Subsequently Afha trunk roluy Will lie (lenergizofl. The

Cloning of contacts` 3i-fr anil 238 bring the v stoppingrolay 'Billi'nto rircnit'with the'line rlayvlfl iii-mythe following; path: liattcry V22. u-'iuiling' ot' relay 321, aoqueuve switch (roulant 'lOl-l. ooniluitor *235, ifontart. bark rinlavt i l5 ot' rutol' relay Q23. the` winding f olf stepping relay voulant 9%, roniliwtor tar-'t 225 of the Qlllaiu'l uwiuouou Guitrh contant llll. The! '('louinff nl this riri-uit nauseatheoiurgiaiitiou of'V rolays anil'll, 'inlay Q24 'iclizaafs u viii-uit for tho [irnt auxiliary countiiur relay 521i hv way oi lmtlory F228, contart- Ell. u'iniliug' oi' relay l'll. hack Contact 2:25a ol the lirat Counting relay i201 and irni'it vonsteppingr relay lolay 2li thereupon heroines; looked in a circuit closed hy way otits own rontact lt 'liurtlwrmoro ('loaos ront-act Q3() which plan-0a thal lirst (-ounting rclay 9.01' into a iiartiallycompleted circuit which may `lin suhsequently inail@ coinplvte when thc stepping; rolayY is ilenarguccrl anilpclouos its hack contact 231. Thoenergization of llno'rolay 121 of thu liuorolayf, and tho auqueruo uivitffh from ilu first or normal to its' aiiirniul y-iosin tion. 'That iu lo aay` they motor nuiu'url', Hl ia lufoiuz'ht into vii-nuit hy way nl smpunm uuitrli anular-r. ll't? auil the liront coulant itfi ol`v the linoy rolay` and ihrl anuncia-r awituh ailvanorn uuiliul'ha. control oi 'ita` ulivi-lul mutant lill to lho .hreonnil position in u'liirn Contact 112 is, opc'n. ln the. second poaition of theI sequmur su'itrh, a circuit is clonal il'or the motor magnet (3S or thvr liruan sulcctor lby way ot' sequence switch Contact 111i4 anil the front Contact 19:7 of the, linol relay. `whereupon thu sha'lt LfOis rotatail and a sin ries of contacts are mail@ lmtwoun thel aria 55 and contact-1.30. A circuit lnrrnnil upon the n'ialiing' of iauh auch Contact from hattery 12:2, line relay 121. :sequence su'iti'h cnntact 11G aiul Contact tl() to ground ihrough tho arin' 51" anil traino oil `tho unlvt'or. ThisA circuit is in alrunt of the: path iior tha line relay through thov trunk lino ornilurtora 2555 ami 230 and :atvpi'iing' relay 2:24 ol" the oontroller apparatua. rlho stopping rolav `is therefor@ iloiiwrggizml ini'urinittintly in tha ailvauuo uiorouuul olY tha "brut-li kKrlootor. The: rut rlrimrgizatiou rausua a '.iri-,iiit to lin relosaurl for tho` irst f'ouuling;x relay .Zlll hy Way-ol' battery i326. mutant 23:5, lu ufinllii'ig); lolz rilay Lilli. harlc mutant 233 oi ilu` nrt'onil auxiliary ruuutinif rolay '212. 'front rontart i230 ol ih@ firat auxiliary wanting relay fll I. and hack contant 381 o't' the-storming relay 224. Allier the first closing of tho shunt ririuit hy way olf sommare suriti'h contant lll and oontart (l0. the shunt in opunuil au l th.x stcpi'iingf relay Bill is again nnvrgiavil. whom upon the svi-owl auxiliary counting relay i212 is: mio-rgizirl. llpon thv avc-onli clou-ing" oiI` the shunt circuit. tho soroufl wanting' relay 202 is rnvrpjiaocl. Thus thoy haunting relays are sucrossiirely energia/.ml anil areI lovlcml in loral irruits liy tho alternata` 0n- 'orgiza-tion and iloiueijgization ol" tho stoppingfrlfrv 294 oonl'rollm'l hy the iuierinit- `tout uhun't vii-ruit ot lh@ trunh line rim-uit h V wir" ol'` ronlait (l0 ol the lirua'h Sulirtor. Upon thvI noruiaalion of iiouu'tinry rolajv 20H a ('irruit will liv iflofalil hy jay ol (-ontari'. Q69 oi" relay 208, thex oifghlh onirolliugr auitc-h or hay 23H arul thv \\iiiuliuf. ol' rut-oli rolay 22?'. u'luroupon iluVx 'irruil' olI ilu*y i'runi: lire will lw upruvi'l at i'oniarfl', zlf?. 'l`hif1 ape'ration ot' tlu rut-oil relay will owur upon th@ eighth vloauro ol the @hunt tiri-uit luy Way oi i-,untari' (il). Tho linc relay lill r0- uiaina oncrgfizwl. lioivvrer, until tho shunt Circuit ia broken hy tho arm a6 dropping into tho iigl'hth noti-h ol tho star wlmi-l 55%. 'llhv iiizlith lingua' ll is at this, tiu'w pointing.; inwardly in poilition to engage ra la'tvh trl. The lino relay ll nou' rlvinvrgiawl. this tfn'o virtuil'a l'l'uu'iiurn-ouo hy way ol llw trunhF lino anil lh@ ol'lmr luy way of voulai-,

"(lO--heing open. Current ila-rut oil from motor magnet 08 at the front Contact 125 and a circuit is closed for the motor magnet S1 of the sequence switch by way of sequence switch contact 113 and the back contact 121 of the line relay 121, whereupon the sequence switch moves from the second to the third position. 1n passing out of the second position into'the third, contacts 103, 101,-

523.203, filed November. 1G, 1009. The sequence switch is now in the third position wherein a circuit is completed for the motor magnet (32 of the selector by way of the back contact 138 ot the motor control relay 131 and sequence switch contact 11.0, whereupon the brush carriage of the selector is moved iirst past the brush selector and then over the rows of terminals. In passing the brush selector, a finger L11 thereoie trips the latch 32, allowing a set of brushes 23, 24; and 25 to be swung outwardly on the pivotal rod 2G. These brushes therefore will trail over and make Contact with the three rows of terminals -in the same level. The brush 25 is now connected in a test circuit partially completed through sequence switch contact- 103, the high resistance winding 132 of the test relay 133, the winding of the motor control relay 131 and sequence switch contact 109. It the line connected to the first set ol terminals is not busy, the selector will stop with the brushes in contact with those terminals, but it' the lim` is busy, the potential at the test termii'ial 2S) will he reduced solliciently to prevent the energization ot' test relay 133. fore continue to more -the brushes over the terminals as long as the lines connected to those terminals arebusy. vWhen, however, the test brush 25 makes contact with the test terminal` 29 of a. line which is not busy, a cir cuit will be formed from battery 122 through resistance 14t2, terminal 20, test brush 25, sequence switch- Contact 108, high resistance winding 132 of the test relay 133, conductor 13T. wire clip 53, spring 52, contact lever 43 and plate 50 to ground. The circuit will be completed by way of conductor 13T instead of by way of the motor control relay 131 because as the test brush touches the edge ot the terminal 2S), the arm 43 has not yet broken contact with a tooth of plate 50. Test relay 133 is thereupon energized, closinpr its low resistance locking' windingr 134 by way of contar-t 135 in shunt of the high resistance winding,lr 132. This low resistance path creates a llow of current through resistance.l4. 2,which is '.lhe'brush carriage will there-v sullicicnt to materially reduce the potential at the test terminals 2S) ot' all the selector svi'itchcs connected in multiple therewith, so that the line to which connection is being made will be caused instantly to test busy to other switches. A moment later the contact lever 13 drops into the'space between the teeth on the plate and opens the shunt about the motor control relay 131, whereupon-this relay is energized, opening the circuit ot' the motor magnet 62 for the brush carriage at back contact 138, and closing a circuit for the stop magnet G5 by way of sequence switch contact 110vand front contact 130 of said rela-y 131. rThe brush earriage is therefore stopped suddenly and held by the magnet G5 :for a moment. The brushes 23, 2-1 and 25 are now in contact with the terminals 27, 28 and 29 of a nonbusy line. The closing' of contact 130 ot' the motor control relay 131 also completes a circuit lor the motor magnet 81 of the sequence switch by way o1l sequence switch contact 111, said contact 13S) and sequence switch Contact 110. The sequence switch there-r upon movos out or" the third position and into the i'th, it being` under the control of the special switch contact 101 in passing the fourth position. The fifth is the talking position o1l the sequence switch; that is to say, the circuit of the trunir line conductors and 236 is now closed to the brushes and 2st by way of sequence switch contacts 10G and 107 respectively. In this position the local circuit for the motor magnet GS of the brush selector is closed by way olt sequence switch Contact 115 and the brush selector, haring' no further -function to perform with respect to the connection being made, is returned to its normal position. It is caused to stop in its normal position by the opening ol this local circuit at Contact 59 when the free end of the arm 50 drops into the deep notch inthe star wheel 58.

To restore the apparatus to its normal condition, contacts 211., 237, 238, 232 and 234 may be opened. The opening oi' contacts and 234 releases the counting relays hy opening their local locking circuits. The opening oi contacts 237 and 233 disconnects the stepping relay from the trunk line circuit and this is preferably done before the circuit is used for telephonie communication. The opening ot contact 241 releases trunk relay 123, whereupon contacts 127 and 123 are closed and contacts 126 and 120 opened. The closing' of contact 123 completes a. circuit 'lor the motor magnet 81 of the sequence switch by way of sequence switch contact 102. The sequence switch thereupon advances to the seventh position. 'llhe opening of contact 129 causes the motor control relay 131 to be denergized, whereupon its back contact 13S is closed, and when the sequence switch reachesthe seventh posiliss elleetive "iindv Said vstop"devieefie render-eil :intl controlled by ii'contacvt oisniclf' relfiyaa motorr'nagnet end'lastop magnet for said Sele'etolg'andn'relaylncluded 1n en' undivided portion of said testeireuit adapted "to:

effect the' operationof said lmagnets in ltern'ate positions respectively offits armature."

710;' 1f The-combination vwith" i selector hav#y inglztgtesltihrush and zi'i'ow llofterininals adapted' tohe"traverse(l 'there'hyg `y of means' 'orf ohalrrgingfthe electrical condition-of said terniinals'faiconclnctor including' fr testing devicemluptedfto' respond fupofn eoiiteet of Saiillteet brush Withfn terminal having the unelmugeilelectrical Condition, andv rrniotor magnetA und n Stop vmagnet for said Selector uri-ringed 'to' respond 'yinl 'Si'x'eeeesion iimler the oontrol'oi" siiil testing device.

lli-ln n telephone exchange. systeinthe eoinbilmtion with n" Selector switcli,n ei1' enit" therefor ineli'irling a .testing vdevine zlnpterl toresponrl when yConnection is Houle hy Sziirlswiteh tonniclle line,zt'n iotor magrnettor"sai l seleetor, a sequence switch, :l motor mgn'et'ffor said sequence Switch, Said testing clevie being adapted ini f itsV response to open t'hefeireiiit 'ofthe yselector?motor nia'gnet-fnnclto i elose' thej' Vcircuit' off 'the ,se# queneeswitehliniotor :magnet anfleeid se q'nenee iswiteli being* adnptecl'qinits' response to elose lafcontect in the line cirenit lleerling tofsai'd'sele'etor. r i y f llQNfIn' aff'telephone exchongefsystem, the oomhinationfwith an automatic:2 selector, a test eircuittlierefor inclnclingfa higfhgresisth ance rellev'nfl a low resistance 'relay in series, mmotor'lnfagnet oontrolleclhy saidflow resiStanc'ereley,"a; lo'vv resistance shunt ot' said high resistance relay, sind means for Closing sidfshunt' Wheneonneetion is meile hy the selector to an vvile line. y

i 13. In a telephone exchange, :i selector having'i'anbrnsh, circuit vterminal contacts 4 traversed -hy- 'Said brush, a; test'eircuit-or said selector, a relay in saidoirouijt 'for oontrollingV the advance movement 1 ofV the selector, andai an" -mtermpter `operaaitlng.;lin said high 'resistance and'inellding! the winding of a relay', and' anothero said paths being of low resistance Lieegeee adi'un'ee movement oi" the eeleetor.

The eomlmmtion with' an automat/1"" seletorhaving n test brush' and a` row ofiig of ii'tesst circuit eonneotefl to finirly brush, tivo relay's'inoliidecl in 'seid 'eiren'ilT one of sziidf relays having' a high V`ieeietenee whirling,l .find being adapted when connection' ienizu'le to the termi-nal of nn irlle'line toeloee :i low' resistzineel shunt path about]-itsininrling 'the other of said relays being arranged toren! trolfthegidvenee movement of said'seleetor, and a switching device actuated in the more` inentof the-seleetorto intermittently render' '90T the last mentioned relay'irresponeive to flow of eiirrelnt in Said test cireuit.l `r

' llrllhe oomhination' -With :in mitoln'etie Seleetorhaving fr test brush and n reiner terminals adapted toffhe traversed therehy,f 5-

of a, test eir'e'i'iit including two relays lin eerie/s,"one'io'IE Suid relays beingv adapted t'o eliinge the electrical condition of serial' terll minnie; :intl the oli-livret seid relays heini;` nrringrml'to' control the nflvzmee' movenieiitxit 100 the selector, nml mi 4'interriipter :ietunteflin the movement oi the selec/torto intermittentlyhlose :i shunt enfomt `Aabout the lnst mentioned relay while the test brush' is trav-1 erging tliespnces between adjacent terminals; i205 17; `'The eoinhinntionfwith :in 'automatic S leetori`l1aving a test' brush land a. rowo'f' terminale adapted to he travereefltherehm off'aftest circuit ineluding'tiro' relays in-r seriee, on'e'liaving nhigh resistance winding im :inrlf kzi-lio\i resistance Winding' in parallel i Path," seid low resistance"Winding being' normally vopen at a, eontnct of Seidl relay, thefotherfoif sind relays heing errangecl'to l efintrolthe 'f1-drame. oi'r the selector, 4:mfl enf 'interrnp'ter controlling' a. I@hunt of the last mentioned'v relay, sii-irl interrnpte'r being' Arie-5 timteel in 'the movement of ythe selector 'to open snidslnmt when the test 'hrush'is in? Contact with each or". mid. terminale. f

ln a'teleph'one exeh'nngejaselector hvv ingeihrush. circuit terminal contacts travi ersed fby said brimhga test 'circuit'ffor (Said: selector including electriealiy actuated meansiiiorfeontrolling the Sidvance move-l ment of' thelv selector, endfmean's ioperable during said' movement to short cireiiitsaid f =.leetrieallyy actuated means ela'eh time'eaid' brush is in transit from one Contact terminal high resistance test conducto' :nin

19. The Combination with :i plurality' 0f l nintnnce .wiinling in Ciirciiit wit selectors Comprising test tuniinnln nniltiplied on the sever-il selectors and test hruslies adapted to trail over Smal terminals, (rt :i

sistance conductor adapted to he cnnnevtccl to each of Said brushes, and Switch mech anisin :irrangsd to connect the high insistance conductor in 'circuit when the brushes are trailing over terlninals and the inw M+ bintanc@l conductor in circuit Whn the hrnshers :irereSting ,in connction with any of smidv trininals.

20. The cmhination with :t plurality of selectors comprising' test terminals multiplied on the Several Selectors; .find tvstlnrfnshonv adapted to trnil over smid. terminals, of :t high 'resistance test mnnluctnr nirinngid to hn nominated to @zich of sind hrilsshihA when trailing' over'terminnlsand n low rvsintzxnm,

conductor arranged tu' hn connected tn unizh of mill brushes when rusting on any toru ininal.

21. 'lfhc combination with :i aluraility nl" selectors comprising test terminals' n1nltiplied on the several Selectors :1n-cl test brushes adapted to trail river Said terminals`r of a relay for each selector having high and low resistance windings, switching mechanism adapt-ed to connect said high resifstnncn winding in circuit with the test brush of said selector when trailing over said ternihals, and :i Contact of said itlziy adapted tu he clnfsefl to include saliti low resistanc@ wind.- ing in circuit with said brush when resting upon any` terminal. Y

2Q. Thi combination with n snlectoi hm'- ingf; i'xml nml movable mintnct, (if :i taht ri luy havingn high rimistani'e winding' unil n low resistant-,e loukinggj windingq switching; mechanism for connecting Snifl high reand :i low rai nhl@ multim@ Ah n movzihln Contact n'l'mn moving. menne; for closing; snifl lon' resistant@ locking whirling whnn finiti brush is; renting npnn any lined Contant1 meuh# iin* :iilrninfingnntl instnringmitl mov nml :i sec-hiena@ switch associ :itvfl witl i nimmt; :intl oiiintingg; to @pan the circuit nl? nhl hicliingg Wintl-ing;l in rant-0r@ Suhl relay.

23. The cmnhinntinn with :i nnlnctor, nl :i

twist circuit thru'foi' having :i path ot high resistunv@ clonar! hiring the limiting onomtion und :i path oil.: ln'w insistiiincn upon thiringg; thiy tun-tinf;` oi'mifitimi, inenns om 'illnifl h v thiw oi msi-runt in @nifl high ra, nnen path t'nr cloning' Suhl hin' rhsistzincv with. ii, motor matinal; ihr mlmni'fi i,j .nhl fir-lhitm.. :i rmstnrinsi rin-nit inr miti #Mentor anni n 1iint ii' nitiril Hilary in #nifl low iciaiiatainri with nml mntrhllinfi :it itis lmultunntmft niiitl rostnrinnl (firi'llil.

y'in nonihinzilfmitA n puweirclriron trin'ih hunting' switvln hnringi' n, ninn'nntin clutch milnptni'l tn nilvzmun this Same, (if ai. test rainy having; :i hi l; uml n, hm' resistance whirl-- ing, the hin ri-*sistnnrfn winding heini); ineluded in :i virifnit (hiring the testing); npmw tion and thvl low rmistnno@ Winding); whcin connectiun is (istzihlie mil with :in idle` trnnlm :unl :i motor-Contrl relay in circuit with said low rhsiistiince Winding;1 :intl mintiollint :it :i hut-l; Contact 'the circuit of the n'iigljnet clutch.

.ln wil-nime; whireoi", 'L hereunto suhcrih my naine thinA thiril clay of lfhxcvliilicri 1li. ll., 1909.

lfllfl R. llllUlllCltlll'.,

W itn @silos lnx'inn ll'liifwiluniuin llhmii: l". han nimm.

li tl 

